节点坐标获取新法—XYZ法

A NEW METHOD FOR CAPTURING NODE COORDINATES-XYZ METHOD

1.引言 我们在开发AUTOCAD绘图软件的基础上,寻找到了用微机辅助获取有限元模型网格节点坐标值的功能,同时解决了IBM微机与大型计算机(如VAX)直接传输问题,从而形成了本文提出的方法——XYZ法。该方法的基本思路是:一个实际三维结构可用多切面(平面问题)图形描述。即(1)可在IBM-PC机上利用AUTOCAD程序获得结构各切面视图绘图文件(×××·DWG)。(2)然后,在PC机上AUTOCAD绘图程序执行中调出某切面绘图文件,设置新层(NGW LAYER),在新层上捕捉未来计算模型节点图素。(3)调用DXFOUT命令,将仅含有计算模型节点图素的信息,存入×××·DXF文件。(4)把只含有节点图素信息的绘图交换文件(×××·DXF)拷贝入微机软盘。(5)

A new method based on Microcomputer Aided Design Program package for capturing node coordinates in finite element mesh is described. It provides a way to avoid errors in manually measurig node coordinates and mistakes in hand transfefing data with terminals. The main idea of this method is that a Microcomputer captures the drawing element information containing nodes of a finite element model and then transfers it to data of stress analysis. This method has been practically confirmed to be especially efficient, accurate, convenient in stress analysis for a large scale aircraft structure.